API Stress Coat, 16 OZAPI STRESS COAT water conditioner makes tap water safe for fish by removing chlorine, chloramines and heavy metals from tap water, and contains the healing power of Aloe Vera to reduce fish stress by up to 40% and to heal damaged tissue and wounds. API STRESS COAT water conditioner also reduces electrolyte loss in your fish, and should be used when: Handling, netting, or adding fish to a bag for the trip home from the store Starting an aquarium